Manufacture of wool-paper.



UNITED STATES PATENT OFFICE.

HANS ZILLES, OF MANNHEIM, GERMANY, ASSIGNOR TO THE HOFFNUNGS THALER PAPIERFABRIK A. 85 R. GELDMAOHER, OF HOFFNUNGSTHAL,

GERMANY.

MANUFACTURE OF WOOL-PAPER.

SPECIFICATION forming part of Letters Patent No. 693,941, dated February 25, 1902.

Application filed October 2'7, 1899- Serial No. 734,974. (No specimens.)

To all whom it may concern:

Be it known that I, HANS ZILLES, doctor of philosophy, a subject of the King of Prussia, Emperor of Germany, residing at Mannheim, Germany, have invented certain new and useful Improvements in the Manufacture of Wool-Paper, of which the following is a specification.

This invention relates to a method for the manufacture of wool-paper-that is to say, a paper having a rough surface and a woolly appearance and particularly adapted for use as wall-paper. It has hitherto been usual to produce such paper, for example, on a papermachine provided with two wires or sieves by making an ordinary web of paper on the lower wire or sieve and at the same time a second web of paper composed of sized animal-wool fibers on the upper sieve or wire and then pressing the two webs of paper together at a suitable point, so that a finished product was formed that was smooth on the lower side, while the upper side, on the contrary, was rough and had a woolly appearance.

Now the method of this invention difiers from that hereinbefore mentioned both in being much simpler and in the use of different material.

According to the new method the wool-paper is produced at one and the same operation on an ordinary paper-machine with a single wire or sieve by mixing with the raw material for the paper, hereinafter called the paper-pulp, a corresponding quantity of coarser vegetable fiber, particularly ground wood fibers. The pulp may be formed of any suitable material and in any usual and wellknown Way. This pulp is then run upon the paper wire or sieve in the known manner for the production of the paper.

The wool-paper produced by the present method is characterized by being produced much more cheaply than similar wool-paper hitherto known, and, further, by the rough and woolly appearance of its surface, whereby a combined effect is produced that has not hitherto been attained. In the production of this new wool-paper, which is therefore com posed of a mixture of fine fibers with coarser fibers, preferably the fibers of wood which have been previously ground, the coarser fibers are deposited in all directions on and beside one another, so that the finer fibersare prevented from forming a close thin web of. paperthat is to say, there are'formed on the surface of the paper depressions and small cavities and, further, the ends of the upper pulp fibers lie free orstand out, so that a rough surface and a woolly appearance are produced. The coarser fibers will be dyed with a free-runnin g color contrasting with the color of the pulp, and when they are mixed with the paper-pulp the dye will be partially transferred from the coarse fibers tothe pulp, and a product will be obtained in which the coarse fibers will have a darker shade of color than the pulp, and the two shades will merge into each other uniformly and produce a very pleasing effect.

I claim The herein-described method of manufae= 'turiug paper having rough surfaces and a mottled woolly appearance, which consists in forming a pulp of fine fibrous material, dyeing relatively coarser wood fibers with a freerunning color contrasting with the color of the pulp, then mixing said dyed and rela tively coarser fibers with the said pulp and transferring some of the color from said fibers to the pulp, and finally converting the mixture into a paper with the coarser fibers proj-ecting from the surfaces thereof, substanv tially as set forth.

In witness whereof I have hereunto signed JAooB ADRIAN, MINA VEIGEL. 

